Casing-pulling device



Feb. 16 1926. 1,572,983

w. A. BARRIER GAS I NG PULLING DEVI CE Filed NOV. 12, 1923 f zya 4 I is) f :1. :2 1

gjvwentoc 14% A Bar/6'62" Patented Feb. '16, 1926. 157M853 UNITED STATES PATENT oFFicE.

WILLIAM A. BARRIER, OF FREDERICK, OKLAHOMA.

- GASING-PULLING DEVICE Application filed. fiovember 12, 1923. Serial No. 674,299.

To all whom it may concern: this grappling device is to be inserted in Be it known that I, \ViLLIAM A. BARRIER, order that the casing may be withdrawn a citizen of the United States, residing at from the well. The device includes a bar Frederick, in the county of Tillman and 2 provided with a plurality of slots 3. 1n

State of Oklahoma, have invented certain each slot 3 there are pivoted two pawls 4-. new and useful Improvements in Casing The edges 5 of these pawls are provided Pulling Devices, of which the following is with teeth and are cam-shaped in formation a specification. so that they will engage the casing upon he present invention relates to a casing the bar 2 being lifted; The pawls are freely 10 pulling device used in extracting cases from movable so that when the device is lowered wells particularly oil wells and the princlinto the casing the pawls will ride freely pal object of the invention is to provide a over the walls thereof, and when raised will device of this nature of simple, compact automatically grip the walls so as to make and durable construction, of such conformathe device and the casing relatively station- 15 tion as will permit of its being lowered into ary. The lower end of the bar 2 is rounded well casing without being obstructed in as at 6 so that it may be more easily inits descent by irregularities or bends in the sorted into the end of the casing; It is casing, and which will, when in operative evident that as many slots 3 may be utilized position, engage the casing with such tenacas desired and that there should be two 20 ity as to insure its proper operation. pawls in each slot extended in opposite di- Another important object of the invention rections.

is to provide a device of this nature which lVhat is claimed is: 05

is durable, reliable in operation, inexpensive In a casing pulling device, an elongated to manufacture, and well adapted for the plate having a downwardly curved lower purpose for which it is designed. end edge and provided with a pair of longilVith the above and numerous other obtudinally spaced and aligned transverse jects in view as will appear as the descripslots in the lower end portion thereof, a

tion proceeds, the invention resides in cerhorizontal pivot pin carried by the bar and tain novel features of construction, and in extending across each slot parallel with the an the combination and arrangement of parts plane of the plate, and a pair of oppositely as will be hereinafter more fully described projecting pawls having their inner ends and claiimd. in coiniguous side by side relation and piv- 775 In the drawings: oted on the intermediate portion of each Figure 1 is a sectional view through a pivot pin within the slots thereof so as to casing showing my device associated therebe freely swung uynvardly and toward each i h; other upon lowering of the plate into a Figure 2 is an elevation of the lower end well casing by engagement with the latter 8 of h d i and and to be caused to swing apart and down- Figure 3 is an elevation of the lower end wardly into grippingengagement with the of the device taken at right angles to that inner surface of such casing when the plate shown in Figure 2. is elevated.

Referring to the drawing in detail it will In testimony whereof I afiix my signature. be seen that 1 designates a asing in which lVILLIAM A. BARRIER. 

